At which temperature are pollen grains stored (in $^{\circ} C$)?

What is the function of the filiform apparatus during the entry of the pollen tube into the ovule?

Which of the following statements is $NOT$ correct?

The entry of the pollen tube through the micropyle is known as:

Identify the correct sequence of events of pollen-pistil interaction given below.
$(a)$ Pollen tube grows through the stigma,style and reaches the ovule.
$(b)$ Pollen grain lands on the stigma.
$(c)$ Pollen germinates to form pollen tube.
$(d)$ Pollen tube carrying $2$ male gametes enters the ovule.
Choose the correct option.

Pollen-pistil interaction is: